Wen-Long Yuan; Xiao-Cong Ai; Xiao-Bin Ji; Shen-Jian Chen; Yao Zhang; Ling-Hui Wu; Liang-Liang Wang; Ye Yuan
|Based on?J/ψ?events collected with the BESIII detector, with corresponding Monte Carlo samples, the tracking efficiency and its systematic uncertainty are studied using a control sample of?J/ψ→pp???π+π?. Validation methods and different factors influencing the tracking efficiency are presented in detail. The tracking efficiency and its systematic uncertainty for protons and pions with the transverse momentum and polar angle dependence are also discussed.|
Lan-Chun L¨u; Chun Du y; Yaquan Fang; Hong-Jian He; Huijun Zhang?
|The LHC discovery of a light Higgs particle?h0?(125GeV) opens up new prospect for searching heavier Higgs boson(s) at the LHC Run-2, which will unambiguously point to new physics beyond the standard model (SM). We study the detection of a heavier neutral Higgs boson?H0?via di-Higgs production channel at the LHC (14TeV),?H0→h0h0→WW?γγ. This directly probes the?Hhh?cubic Higgs interaction, which exists in most extensions of the SM Higgs sector. For the decay products of final states?WW?, we include both pure leptonic mode?WW?→?ν???ν?and semi-leptonic mode?WW?→qq?′?ν. We analyze signals and backgrounds by performing fast detector simulation for the full processes?pp→H→hh→WW?γγ→?ν???νγγ?and?pp→H→hh→WW?γγ→?νqq?′γγ, over the mass range?MH=250?600GeV. For generic two-Higgs-doublet models (2HDM), we present the discovery reach of the heavier Higgs boson at the LHC Run-2, and compare it with the current Higgs global fit of the 2HDM parameter space.|